Gypsum (adfe600f-677e-44d8-bb1d-0f1a2b7159c5)
- Organization:
- The American Institute of Mining, Metallurgical, and Petroleum Engineers
- Pages:
- 12
- File Size:
- 1153 KB
- Publication Date:
- Jan 1, 1949
Abstract
PURE gypsum may be broken down into its constituents as follows: [ ] Standard specifications (ASTM Designation C22-25) state that a material shall not be considered gypsum if it contains less than 64.5 pct by weight of CaS042H2O. Anhydrite, the second calcium sulphate mineral found in nature, may be broken into its constituents as follows: [ ] PROPERTIES OF GYPSUM AND ANHYDRITE Pure gypsum is colorless to white but various impurities change its color to shades of gray, brown, red, or pink. It has a hardness of 2 in the Mohs scale and can be scratched with the fingernail. The specific gravity of pure gypsum is 2.3 to 2.4, so that rock gypsum, free from moisture, weighs about 145 lb per cu ft. Gypsum crystallizes in the monoclinic system in tabular crystals that exhibit good cleavage
Citation
APA: (1949) Gypsum (adfe600f-677e-44d8-bb1d-0f1a2b7159c5)
MLA: Gypsum (adfe600f-677e-44d8-bb1d-0f1a2b7159c5). The American Institute of Mining, Metallurgical, and Petroleum Engineers, 1949.